Search for dissertations about: "heterogeneity of variance"

Showing result 1 - 5 of 35 swedish dissertations containing the words heterogeneity of variance.

  2. 1. Determinants and Consequences of Language-in-Education Policies : Essays in Economics of Education

    Author : Christelle Garrouste; Holger Daun; Henry M. Levin; François Grin; Stockholms universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Language-in-education policies; decision-making analysis; non-cooperative game; language skills; HLM; human capital theory; rate of return analysis; post-colonial Africa; IALS; SACMEQ; International education; Internationell pedagogik; internationell pedagogik; International Education;

    Abstract : This thesis consists of three empirical studies. The first study, Rationales to Language-in-Education Policies in Postcolonial Africa: Towards a Holistic Approach, considers two issues. First, it explores the factors affecting the choice of an LiE policy in 35 African countries. READ MORE

  4. 2. Water supply in hard rock coastal regions : The effect of heterogeneity and kinematic porosity

    Author : Robert Earon; Bo Olofsson; Gerhard Barmen; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Coastal aquifer; Crystalline rock; Water balance; Geographic information systems; Water supply planning;

    Abstract : Water resources in hard rock terrain are difficult to characterize due to heterogeneity and anisotropy in the fracture network, low porosities and limited recharge volumes available during the summer season. Three methods were developed and evaluated in order to assist in water supply planning. READ MORE

  5. 3. Society Inhaled. Social Epidemiology of COPD

    Author : Sten Axelsson Fisk; Socialepidemiologi; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Social Epidemiology; Social Medicine; Chronic obstructive pulmonary disease COPD ; Intersectionality; Smoking : epidemiology; Social determinants of health;

    Abstract : Chronic Obstructive Pulmonary Disease (COPD) is a common disease that in its advanced stages is a life-limiting condition and a leading cause of death globally. This thesis aims at increasing the understanding of the socioeconomic disparities that exist both for COPD and its major risk factor, tobacco smoking. READ MORE

  6. 4. Spatial Spread of Organisms : Modeling ecological and epidemiological processes

    Author : Tom Lindström; Uno Wennergren; Colleen Webb; Linköpings universitet; []
    Keywords : Spatial kernel; Spatially explicit modeling; Disease transmission; Animal movements; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : This thesis focuses on the spread of organisms in both ecological and epidemiological contexts. In most of the studies presented, displacement is modeled with a spatial kernel function, which is characterized by scale and shape. These are measured by the net squared displacement (or kernel variance) and kurtosis, respectively. READ MORE

  7. 5. Genetic Heteroscedasticity for Domestic Animal Traits

    Author : Majbritt Felleki; Erling Strandberg; Lars Rönnegård; Ole Fredslund Christensen; Högskolan Dalarna; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Quantitative genetics; genetic heteroscedasticity of residuals; genetic heterogeneity of environmental variation; genetic heterogeneity of residual variance; double hierarchical generalized linear models; teat count in pigs; litter size in pigs; milk yield in cows; somatic cell count in cows; Complex Systems – Microdata Analysis; Komplexa system - mikrodataanalys;

    Abstract : Animal traits differ not only in mean, but also in variation around the mean. For instance, one sire’s daughter group may be very homogeneous, while another sire’s daughters are much more heterogeneous in performance. The difference in residual variance can partially be explained by genetic differences. READ MORE